Improvement in shuttles for sewing-machines



J. IE. HUTTON, Shuttlefor Sewing-Machine;

No. 200,305. Patenfed Feb. 12, 1878.

UNITED STATES PATENT OEEIoE.

JAMES F. HUTTON, OF BERRY STATION, KENTUCKY.

IMPROVEMENT lN SHUTTLES FOR SEWING-MACHINES.

Specification forming part of Letters Patent No. 200,305. dated February12, 1878; application filed November 26, 1877. V

7 To all whom it may concern:

Be it known that I, JAIVLES F. HUTTON, of Berry Station, Harrisoncounty, Kentucky, have invented a new and useful Improvement in TensionDevices for Shuttles, of which the following is a specification:

The object of my invention is to constructa simple and effective tensiondevice for shuttles -an object which I attain in the following manner,reference being had to the accompanying drawings, in which- Figure l isa longitudinal vertical section of a shuttle with my improved tensiondevice applied thereto; Fig. 2, a plan view of the shuttle, and Fig. 3 atransverse section on the line 1 2.

A is the casing of the shuttle, and B the bobbin, the stem of the latterbeing adapted to suitable bearings in the casing A. The

head of the shuttle is slotted at the top for the reception of a lever,D, pivoted at a, and having a short arm arranged to bear on theperiphery of the head I)' of the bobbin. The long arm of the lever D isacted upon by the end of the stem of a set-screw, e, the head of whichis contained within a recess, f, formed in the under side of theshuttle-head.

In the head of the screw-stem e is formed a square or angular opening,t, to which may be adapted the correspondingly-shaped end of a suitabletool, by which the screw-stem may be turned in either direction, so asto regulate the pressure of the short arm of the lever D upon the headI) of the bobbin, thereby governing the tension upon the thread as it isdrawn off the said bobbin. The head I) of the bobbin and thebearing-surface of the short arm of the lever D may be made of hardenedsteel or chilled iron, so as to prevent undue wear.

The lever D is more certain in its action and not so liable to get outof order as the spring bars or plates usually employed as tensiondevices for shuttles, and the various parts may be so proportioned thatthe friction of the short arm of the lever D upon the head of the bobbincan be regulated with the utmost nicety.

I claim as my inventi.on

The combination of the shuttle-casing A, the bobbin B, adapted tobearings in the cas: ing, and having a head, I), the lever D, having ashort arm adapted to bear upon the periphery of the head b, and thescrew 6, for adjusting the lever, all substantially as specified.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JAMES F. HUTTON.

Witnesses:

P. WHERRITT, THos. WHERRITT.

